色素蛋白

例句：

1. 1. The pigment protein in the skin is responsible for its color.
   皮肤中的色素蛋白负责其颜色。
2. 2. The pigment protein in the eye is crucial for vision.
   眼睛中的色素蛋白对视力至关重要。
3. 3. The pigment protein in the hair is what gives it its shine.
   头发中的色素蛋白赋予它光泽。